L4931ABD33-TR

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4931ABD33-TR is a positive fixed linear low-dropout (LDO) voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3V with a maximum continuous output current of 250mA. The device supports an input voltage range up to 20V and features a typical dropout voltage of 0.4V at full load. It incorporates internal current limiting and thermal shutdown protection. The component operates within a temperature range of -40°C to +125°C and is housed in a DPAK surface-mount package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Very low dropout voltage enabling efficient operation near the input rail
• Logic-controlled electronic shutdown for power management applications
• Internal current limit and thermal overload protection
• Requires only a small 2.2 µF capacitor for stability

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered systems requiring low quiescent current
• Local voltage regulation in portable electronics
• Low noise power supply circuits
• Standby mode control in embedded systems

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'AB' indicates the ±1% output voltage accuracy selection, distinct from the standard 'C' variant which offers ±2% accuracy. Confirm the 'D' suffix corresponds to the DPAK package type and the '-TR' designation indicates tape and reel packaging. Ensure compatibility with the required thermal dissipation capabilities for the intended application environment.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a precise 3.3V output with tight tolerance is required alongside low power consumption. The AB grade ensures higher voltage accuracy compared to the C grade. Consider the DPAK package for its balance of thermal performance and board space efficiency. Verify that the input voltage does not exceed the 20V maximum rating under all operating conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L4931 family of very low drop regulators designed for low power and low noise applications. The family includes variants in SO-8, DPAK, and TO-92 packages. The L4931 series is characterized by its ability to operate with minimal external components and its suitability for battery-operated devices due to low standby currents.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

L4931CD33-TR: Offers similar electrical characteristics but with ±2% output voltage accuracy instead of ±1%. L4931ABDT33-TR: Identical electrical specifications and accuracy; verify if the package designation difference implies any physical or pinout variations.